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Volumn 49, Issue 26, 2008, Pages 4156-4159

Rapid stereoselective access to the tetracyclic core of puupehenone and related sponge metabolites using metal-free radical cyclisations of cyclohexenyl-substituted 3-bromochroman-4-ones

Author keywords

Bromoketone; 6 endo Trig; Benzo a xanthene; Lauroyl peroxide; Merosesquiterpene; Puupehenone; Radical cyclisation; Sesquiterpene phenol

Indexed keywords

15 OXOPUUPEHENOL; 4 CHROMANONE DERIVATIVE; FREE RADICAL; METAL; NATURAL PRODUCT; PHENOL; PUUPEHENONE; SESQUITERPENE;

EID: 43849110459     PISSN: 00404039     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.tetlet.2008.04.114     Document Type: Article
Times cited : (13)

References (64)
  • 55
    • 43849093349 scopus 로고    scopus 로고
    • note
    • f 0.27 (hexane-EtOAc, 3:1).
  • 57
    • 43849097243 scopus 로고    scopus 로고
    • note
    • Procedure for the formation of 23b: A solution of the bromoketone 22b (0.520 g, 1.15 mmol) in dry degassed 1,2-dichloroethane (12 mL) was heated to reflux for 15 min. A solution of dilauroyl peroxide (0.921 g, 2.31 mmol) in dry degassed 1,2-dichloroethane (7 mL) was added dropwise via a pressure-equalising dropping funnel to the refluxing solution over 2.75 h. After the completion of the addition, heating was continued overnight (18.5 h). The reaction mixture was cooled to room temperature and filtered through a pad of basic alumina (5 mm) on top of a pad of silica (20 mm), which was washed successively with EtOAc-hexane (3:1, 80 mL) and dichloromethane (150 mL). The combined filtrate was concentrated in vacuo and purified by flash column chromatography (EtOAc-hexane, 1:9), which gave recovered bromoketone 22b (0.070 g, 13%) and the title compound 23b (0.287 g, 67%, 78% based on recovered 22b) as a white solid.
  • 58
    • 43849083407 scopus 로고    scopus 로고
    • note
    • 2) was 0.0907 (all data). Crystallographic data (excluding structure factors) for 23b have been deposited with the Cambridge Crystallographic Data Centre as supplementary publication number CCDC 679032. Copies of the data can be obtained, free of charge, on application to CCDC, 12 Union Road, Cambridge CB2 1EZ, UK (fax: +44-1223-336033 or e-mail: deposit@ccdc.cam.ac.uk).


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.